 /*******************************************************************************
  * Copyright (c) 2003, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.osgi.framework.internal.core;

 import java.io.IOException ;
 import java.net.URL ;
 import java.util.*;
 import org.eclipse.osgi.service.resolver.ExportPackageDescription;
 import org.osgi.framework.BundleException;

 /**
  * The System Bundle's BundleLoader. This BundleLoader is used by ImportClassLoaders
  * to load a resource that is exported by the System Bundle.
  */
 public class SystemBundleLoader extends BundleLoader {
     public static final String EQUINOX_EE = "x-equinox-ee"; //$NON-NLS-1$
 ClassLoader classLoader;
     private HashSet eePackages;

     /**
      * @param bundle The system bundle.
      * @param proxy The BundleLoaderProxy for the system bundle
      * @throws BundleException On any error.
      */
     protected SystemBundleLoader(BundleHost bundle, BundleLoaderProxy proxy) throws BundleException {
         super(bundle, proxy);
         ExportPackageDescription[] exports = proxy.getBundleDescription().getSelectedExports();
         if (exports != null && exports.length > 0) {
             eePackages = new HashSet(exports.length);
             for (int i = 0; i < exports.length; i++)
                 if (((Integer ) exports[i].getDirective(EQUINOX_EE)).intValue() >= 0)
                     eePackages.add(exports[i].getName());
         }
         this.classLoader = getClass().getClassLoader();
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the class.
      */
     public Class findClass(String name) throws ClassNotFoundException {
         return classLoader.loadClass(name);
     }

     /**
      * This method will always return null.
      */
     public String findLibrary(String name) {
         return null;
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the class.
      */
     Class findLocalClass(String name) {
         Class clazz = null;
         try {
             clazz = classLoader.loadClass(name);
         } catch (ClassNotFoundException e) {
             // Do nothing, will return null
 }
         return clazz;
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the resource.
      */
     URL findLocalResource(String name) {
         return classLoader.getResource(name);
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the resource.
      */
     Enumeration findLocalResources(String name) {
         try {
             return classLoader.getResources(name);
         } catch (IOException e) {
             return null;
         }
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the resource.
      */
     public URL findResource(String name) {
         return classLoader.getResource(name);
     }

     /**
      * The ClassLoader that loads OSGi framework classes is used to find the resource.
      */
     public Enumeration findResources(String name) throws IOException {
         return classLoader.getResources(name);
     }

     /**
      * Do nothing on a close.
      */
     protected void close() {
         // Do nothing.
 }

     public boolean isEEPackage(String pkgName) {
         return eePackages.contains(pkgName);
     }
 }

